CLASSIFICATION OF CRUSTACEA. 1443 



6 postici i'nterdum abbreviati cum articulo lmo operculiformi, inter- 

 dum longitudine mediocres. 



1. Ttphinjb. — Abdomen in ventrem se flectens. — Gr. Diihyrus, D., Typhis, R. 

 Thyropus, D. 



2. Pronoin^e. — Abdomen in ventrem se non flectens. Caput non oblongum, an- 

 tennis in capitis frontem insitis. — Gr. Pronoe, Guer., Lycsea, D. 



3. Oxycephalinje. — Abdomen in ventrem se non flectens. Caput oblongum 

 antennis lmis in superficiem capitis inferiorem insitis. — Gr. Oxycephalies, E. 

 Rhabdosoma. W. 



OrdoIL(?) TKILOBITA. 



Subclassis III. ENTOMOSTEACA. 



Ordo I. GNATHOSTOMATA. 



Legio I. LOPHYROPODA. 



Tribus I. CYCLOPOIDEA. 



Pam. I. CALANIDiE. — Oculi duo simplices minutissimi, pigmentis 

 sive coalitis sive discretis ; interdum oculi alii in uno coaliti infra 

 caput deorsum spectantes. Mandibulge maxillaeque elongati palpi- 

 gerse. Pedes lmi nunquam prehensiles. 



1. Calaninje. — Oculi inferiores nulli. Antennae lmae longse, fere trans versim 

 porrectae; dextra maris articulatione non geniculans; 2dae non prehensiles. Max- 

 illae latere interiore setigerae. Abdomen longitudine mediocre. — Gr. Calanus, 

 Leach, Rhincalanus, J)., Cetochilus, Euchseta, Philippi, Undina, D. 



2. Pontellin^i. — Oculi inferiores distincti. Antennae lmae longae saepe oblique 

 porrectae; dextra maris articulatione saepius geniculans; 2dae non prehensiles. 

 Maxillae abdomenque ac in Calaninis. G. Hemicalanus, D., Diaptomus, Westw., 

 Candace, D., Pontella, Acartia D., Catopia, D. 



3. Oithonin^e. — Oculi et antennae fere ac in Calaninis. Abdomen praelongum, 

 cephalothorace vix brevius. Maxillae latere interiore digitatos. — G. Oithona, Baird. 



4. NotodelphinjE. — Antennae 2dae prehensiles, vel monodactylae. — Gr. Nbto- 

 delphys, Allman. 





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